<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
        <Goods
          v-for="(item, index) in goodList"
          :key="index"
          :name="item.name"
          :price="item.price"
          :num="item.num"
          :checked="item.checked"
          :index="item.index"
          @check="check"
          @removeGood="removeGood(item, $event)"
        />
      </thead>
      <tbody></tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ allPriceSum }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import Goods from './components/Goods'
export default {
  data () {
    return {
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false
        }
      ],
      sum: []
    }
  },
  components: {
    Goods
  },
  methods: {
    check (name, checked) {
      const i = this.goodList.findIndex((item) => item.name === name)
      console.log(i)
      this.goodList[i].checked = !this.checked
      console.log(this.goodList)
    },
    removeGood (name) {
      const index = this.goodList.findIndex((item) => item.name === name)
      this.goodList.splice(index, 1)
    }
  },
  computed: {
    isAll: {
      get () {
        return this.goodList.every((item) => item.checked === true)
      },
      set (val) {
        this.goodList = this.goodList.map((item) => {
          return {
            name: item.name,
            price: item.price,
            num: item.num,
            checked: val
          }
        })
      }
    },
    allPriceSum () {
      // return console.log(this.goodList.filter(function (item) {
      //   return item.checked === true
      // }))

      return (this.goodList.filter(function (item) {
        return item.checked === true
      })).reduce((sum, item) => {
        sum += item.price * item.num
        return sum
      }, 0)
    }
  }
}
</script>

<style></style>
